Daikin GYEQ20AN, Руководство по обслуживанию

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Outdoor Unit Control SiAUY361411EA
99 Control and Functionality
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(Cooling/heating) "Stop Preparation Mode" control function
Available with a cooling/heating outdoor unit, this function changes the refrigerant circuit while
the outdoor unit is stopped so that the next startup can be smoothly performed.
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(Cooling/heating) "Refrigerant Recovery" control function
Available with a cooling/heating outdoor unit, this function controls the recovery of refrigerant
accumulated in the outdoor heat exchanger during concurrent cooling/heating operation in low
outdoor air temperatures. The function changes the mode or performs a pump down operation
for approximately 5 minutes every 8 hours.
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(Cooling) "Avoid Low-Side Pressure Drop during Transition" control function
[1.1 System Control Overview] See the Basic cooling control section.
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(Cooling) "Avoid Excessive High-Side Pressure" control function
When high-side pressure 1 is 3.37 MPa or higher, this function is activated to reduce the engine
speed steps in decrements. (1 step every 1 minute)
When high-side pressure 1 is 3.47 MPa or higher, this function further reduces the engine
speed steps in decrements. (1 step every 5 seconds)
The function is cancelled when high-side pressure 1 falls to 3.17 MPa or lower.
The function temporarily stops the outdoor unit if high-side pressure 1 does not fall below 3.60
MPa within 120 seconds.
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(Cooling) "Pump Down for Maintenance" operation mode
When the "Pump Down for Maintenance" function is turned ON from the onboard checker, this
function is activated to automatically perform pump down operation. (Before using this function,
you have to close the stop valve on the liquid side.)
The function completes the pump down operation and stops the engine when the low-side
pressure has remained at 0.12 MPa or lower for 10 seconds or has fallen to 0.05 MPa or lower.
(After using this function, you have to immediately close the stop valve on the gas side.)
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(Cooling) "Oil Return" control function
1 hour after starting the outdoor unit and at every cumulative 1 hour after this, or when the oil
separator oil level is at or below the detection level, this function opens the electronic expansion
valves of any inactive indoor units and performs the oil return operation for approximately 6
minutes.
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(Cooling) "Waste Heat Recovery Capacity" control function
[1.1 System Control Overview] See the Basic cooling control section.
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(Cooling) "Maintain High-Side Pressure" control function 2
When the outdoor air temperature is low, this function is activated to maintain high-side
pressure 1 at a constant level by controlling the fan operation.
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(Cooling) "Outdoor Fan High Static Pressure" mode
Once support for high static pressure has been enabled through the memory switches, this
function is activated to change the fan speed upper limit so that the static pressure on the fan
blowing side is accepted up to 30 Pa.
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(Cooling) "Circuit Reverse" control function
If the previous operation was heating or at the first startup after turning on the outdoor unit
power, this function performs a heating operation for 4 minutes to move the refrigerant in the
link gas pipe to the liquid pipe side.